public class Example4_19 {
	public static void main (String args[]) {
		Student3 zhang = new Student3();
		Student3 geng = new Student3();
		zhang.setAge(23);
		System.out.println("zhang的年龄:"+zhang.getAge());
		geng.setAge(25);
		System.out.println("geng的年龄:"+geng.getAge());
	}
}